linux-toradex.git/drivers/thunderbolt/tb.h, branch v6.7-rc8

thunderbolt: Add support for asymmetric link

2023-10-20T15:18:01+00:00

USB4 v2 spec defines a Gen 4 link that can operate as an aggregated
symmetric (80/80G) or asymmetric (120/40G). When the link is asymmetric,
the USB4 port on one side of the link operates with three TX lanes and
one RX lane, while the USB4 port on the opposite side of the link
operates with three RX lanes and one TX lane.

Add support for the asymmetric link and provide functions that can be
used to transition the link to asymmetric and back.

Signed-off-by: Gil Fine 
Co-developed-by: Mika Westerberg 
Signed-off-by: Mika Westerberg

thunderbolt: Introduce tb_switch_depth()

2023-10-20T15:18:01+00:00

This is useful helper to find out the depth of a connected router.
Convert the existing users to call this helper instead of open-coding.

No functional changes.

Signed-off-by: Mika Westerberg

thunderbolt: Introduce tb_for_each_upstream_port_on_path()

2023-10-20T15:18:01+00:00

This is useful when walking over upstream lane adapters over given path.

Signed-off-by: Mika Westerberg

thunderbolt: Introduce tb_port_path_direction_downstream()

2023-10-20T15:18:01+00:00

Introduce tb_port_path_direction_downstream() to check if path from
source adapter to destination adapter is directed towards downstream.
Convert existing users to call this helper instead of open-coding.

No functional changes.

Signed-off-by: Gil Fine 
Signed-off-by: Mika Westerberg

thunderbolt: Set path power management packet support bit for USB4 v2 routers

2023-10-20T15:18:01+00:00

USB4 v2 spec allows USB4 links that are part of a pass through tunnel
(such as DisplayPort and USB 3.x Gen T) to enter lower CL states, which
provide better power management. For this USB4 v2 routers in their path
config space of lane 0 adapter include a new bit PMPS (PM packet
support) that needs to be set.

Signed-off-by: Mika Westerberg

thunderbolt: Make is_gen4_link() available to the rest of the driver

2023-10-20T15:18:01+00:00

Rework the function to return the link generation, update the name to
tb_port_get_link_generation(), and make available to the rest of the
driver. This is needed in the subsequent patches.

Signed-off-by: Gil Fine 
Signed-off-by: Mika Westerberg

thunderbolt: Make tb_switch_clx_is_supported() static

2023-10-13T05:49:13+00:00

This function is not used outside of clx.c so make it static. No
functional changes.

Signed-off-by: Mika Westerberg

thunderbolt: Get rid of usb4_usb3_port_actual_link_rate()

2023-10-13T05:49:13+00:00

It turns out there is no need to use the actual link rate when
reclaiming bandwidth for USB 3.x. The reason is that we use consumed
bandwidth which is coming from xHCI when releasing bandwidth (for
example for DisplayPort tunneling) and this can be anything between
1000 Mb/s to maximum, so when reclaiming we can just bump it up back to
maximum instead of actual link rate (which is always <= maximum).

This allows us to get rid of couple of unnecessary lines of code.

Signed-off-by: Mika Westerberg

thunderbolt: Log a warning if device links are not found

2023-08-08T05:13:11+00:00

The software connection manager needs the device links in order to
establish the tunnels before the native protocols so log a warning if
they are not found.

Signed-off-by: Mika Westerberg

thunderbolt: Make bandwidth allocation mode function names consistent

2023-06-16T06:53:29+00:00

Make sure the DisplayPort bandwidth allocation mode function names are
consistent with the existing ones, such as USB3.

No functional changes.

Signed-off-by: Mika Westerberg